Sealed in a plastic container to keep the filter components fresh and unexpired
The C2A1 canister is an air filtering device designed to be inserted in the facepiece of the M40 series gas mask. Designed to remove from the air passing through it, toxic and/or irriating chemical vapors, gases and particulate contaminants (dust, fumes, mists, fogs and smoke) including biological organisms likely to be used in warfare.